This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
The problem you mention is fairly common. GS/OS via its FSTs has pretty
strict definitions for what qualifies as a valid DOS or ProDOS diskette. For
example, perfectly good 36-track DOS 3.3 diskettes will not be mounted by the
Finder just because the number of tracks is 36 instead of the expected 35.
Naturally, copy-protected diskettes have practically no chance of being
recognized. Almost certainly, this is the reason the Finder will not mount your
MECC disks.
You can, still, run software from most copy-protected diskettes by just
booting them.
By: Charlie
 
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